Swap is similar to the virtual memory of Windows, but the difference is that Windows can be set under any drive letter of Windows, and the default is C drive, and can be placed in the same partition as the system files. Linux, on the other hand, occupies an independent partition, which is convenient for putting part of the content in the swap partition when the memory demand is insufficient, and continue to execute when there is free memory, also called swap partition, and swap space is part of it.